Turning NPCs to Gold in Oblivion (Xbox 360)? Impossible—Spell Doesn't Exist; Skyrim Has Transmute for Ore
You cannot turn NPCs into gold in The Elder Scrolls IV: Oblivion on any platform. The "Turn to Gold" ability (via the Transmute spell or Philosopher's Stone) does not exist in Oblivion.
What You Might Be Thinking Of
Skyrim: The Transmute Mineral Ore spell turns iron → silver → gold ore, not people.
Oblivion Spells: The closest effects are Paralyze (immobilizes), Frenzy (makes them attack allies), or Command Humanoid (temporary control).
Alchemy: You can create Gold as an ingredient (value 25) but cannot transmute living beings.
Fun Alternatives in Oblivion
Use Conjuration to summon atronachs or undead.
Enchant gear with Soul Trap to fill soul gems for profit.
Complete the Thieves Guild or Dark Brotherhood questlines for gold rewards.